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Cheap flights from Ottawa to Illinois from C$ 240

This is the cheapest one-way flight price found by a Cheapflights user in the last 72 hours by searching for a flight departing on 26/8. Fares are subject to change and may not be available on all flights or dates of travel.
YOW — ORD
3 Aug — 10 Aug1
1 adult

Cheap flight deals from Ottawa to Illinois

Keep the following information in mind while searching for Ottawa to Illinois flight deals. Data was last updated 29 July 2025.

Round-trip from

C$ 444

One-way from

C$ 240

Popular in

November

Cheapest in

May

Average price

C$ 599

Good round-trip deal

C$ 574 or less

Good one-way deal

C$ 471 or less
Porter Airlines
  • Porter Airlines
  • 21/8-26/8
  • 2 total stops
  • 11h 12m total
  • Ottawa to Illinois
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26/8
  • 26/8
  • 1 total stop
  • 27h 50m total
  • Ottawa to Illinois
Search Deals
Highest demand for flights based on searches. 6% potential increase in price (C$ 55 potential increase over avg. RT price).
Search Deals
Cheapest flight prices on average. 1% potential price decrease (C$ 10 potential savings vs. average RT price).
Search Deals
Average for round-trip flights in July 2025
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Price to beat on a round-trip flight from Ottawa to Illinois.
Search Deals
Price to beat on a one-way flight from Ottawa to Illinois.
Search Deals

Find flight deals from Ottawa to Illinois

Cheapest flights from Ottawa to Illinois
Explore the most affordable flight options available from Ottawa to Illinois. Find the lowest fares from popular airlines and budget airlines, with prices last updated on 29 July 2025.

Thu 21/812:35 p.m.YOW - MDW
1 stop4h 49mPorter Airlines
Tue 26/89:40 a.m.MDW - YOW
1 stop6h 23mPorter Airlines
Deal found 28/7C$ 444
Wed 3/96:33 a.m.YOW - ORD
Nonstop2h 27mUnited Airlines
Sun 7/910:50 a.m.ORD - YOW
Nonstop2h 14mUnited Airlines
Deal found 29/7C$ 446
Thu 11/96:00 a.m.YOW - ORD
1 stop4h 51mAir Canada
Thu 18/98:25 p.m.ORD - YOW
1 stop4h 09mAir Canada
Deal found 28/7C$ 450
Fri 19/97:50 a.m.YOW - ORD
1 stop9h 53mWestJet
Mon 22/95:30 p.m.ORD - YOW
1 stop20h 16mWestJet
Deal found 26/7C$ 454
Thu 4/91:25 p.m.YOW - MDW
1 stop3h 59mMultiple Airlines
Fri 5/99:15 a.m.MDW - YOW
1 stop6h 49mMultiple Airlines
Deal found 27/7C$ 484
Thu 11/99:05 a.m.YOW - ORD
1 stop6h 50mMultiple Airlines
Thu 18/95:05 a.m.ORD - YOW
2 stops18h 17mMultiple Airlines
Deal found 28/7C$ 528
Thu 4/95:55 a.m.YOW - MDW
2 stops16h 31mWestJet
Fri 5/910:31 a.m.MDW - YOW
2 stops12h 51mWestJet
Deal found 27/7C$ 708
Thu 21/84:25 p.m.YOW - STL
2 stops22h 07mMultiple Airlines
Mon 25/82:30 p.m.STL - YOW
3 stops25h 50mMultiple Airlines
Deal found 29/7C$ 716
Thu 11/95:25 p.m.YOW - STL
1 stop23h 19mUnited Airlines
Thu 18/97:04 p.m.STL - YOW
1 stop25h 31mUnited Airlines
Deal found 28/7C$ 794
Thu 21/85:55 a.m.YOW - STL
2 stops8h 25mWestJet
Mon 25/83:42 p.m.STL - YOW
2 stops7h 40mWestJet
Deal found 29/7C$ 899
Thu 21/82:25 p.m.YOW - STL
1 stop6h 35mAir Canada
Mon 25/81:30 p.m.STL - YOW
1 stop5h 45mAir Canada
Deal found 29/7C$ 927

Cheapflights Fare Finder

 
Customize your flight search to find flights from Ottawa to Illinois that fit within your specific budget. Explore options based on user searches and filter the results based on your desired price range. Find flights that match your budget for a cost-effective journey. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 July 2025.
Use the filters below to find and compare flights from Ottawa to Illinois that are best for you.

Fly from

Ottawa

Fly to

Illinois

Route

Depart

Return

Price

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 21/8

12:35 p.m.-4:24 p.m.

1 stop4h 49m

Chicago Midway

Tue 26/8

9:40 a.m.-5:03 p.m.

1 stop6h 23m

C$ 444

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Wed 3/9

6:33 a.m.-8:00 a.m.

Nonstop2h 27m

Chicago O'Hare Intl

Sun 7/9

10:50 a.m.-2:04 p.m.

Nonstop2h 14m

C$ 446

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 11/9

6:00 a.m.-9:51 a.m.

1 stop4h 51m

Chicago O'Hare Intl

Thu 18/9

8:25 p.m.-1:34 a.m.

1 stop4h 09m

C$ 450

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Fri 19/9

7:50 a.m.-4:43 p.m.

1 stop9h 53m

Chicago O'Hare Intl

Mon 22/9

5:30 p.m.-2:46 p.m.

1 stop20h 16m

C$ 454

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 4/9

1:25 p.m.-4:24 p.m.

1 stop3h 59m

Chicago Midway

Fri 5/9

9:15 a.m.-5:04 p.m.

1 stop6h 49m

C$ 484

OttawaChicago

YOW - ORD

YOWORD

Ottawa

Thu 11/9

9:05 a.m.-2:55 p.m.

1 stop6h 50m

Chicago O'Hare Intl

Thu 18/9

5:05 a.m.-12:22 a.m.

2 stops18h 17m

C$ 528

OttawaChicago

YOW - MDW

YOWMDW

Ottawa

Thu 25/9

5:55 a.m.-9:36 p.m.

2 stops40h 41m

Chicago Midway

Wed 8/10

12:48 p.m.-12:22 a.m.

2 stops10h 34m

C$ 691

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 21/8

4:25 p.m.-1:32 p.m.

2 stops22h 07m

Lambert-St Louis

Mon 25/8

2:30 p.m.-5:20 p.m.

3 stops25h 50m

C$ 716

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 11/9

5:25 p.m.-3:44 p.m.

1 stop23h 19m

Lambert-St Louis

Thu 18/9

7:04 p.m.-9:35 p.m.

1 stop25h 31m

C$ 794

OttawaSt. Louis

YOW - STL

YOWSTL

Ottawa

Thu 21/8

5:55 a.m.-1:20 p.m.

2 stops8h 25m

Lambert-St Louis

Mon 25/8

3:42 p.m.-12:22 a.m.

2 stops7h 40m

C$ 899

Flights are sorted by cheapest round-trip flights first.

Deals found on 28/7

Showing 1-10 of 22 results
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Best time to book a flight from Ottawa to Illinois

Have a flexible travel schedule? Discover the best time to fly to Illinois from Ottawa with our price prediction graph.
Estimated round-trip price
Rates are based on past data. Find the cheapest month and day to book your flight based on your travel requirements, then search for cheap deals.

Cheapflights Insights

Everything you need to know about your flight from Ottawa to Illinois

What is the cheapest month to book a flight from Ottawa to Illinois?

Currently, January is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 261). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 352). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

What is the cheapest time of day to fly from YOW to IL?

Find hourly flight availability from Ottawa to Illinois. Discover flight options and departure times throughout the day, allowing you to choose a departure time that suits your schedule. Data last updated 29 July 2025.

When flying from Ottawa to Illinois, the time of day you decide to fly out makes little to no difference towards the overall price you’ll pay on tickets.

Weekly flight availability from Ottawa to Illinois

Explore weekly flight availability from Ottawa to Illinois. Discover flights operating on different days of the week, giving you the flexibility to choose a travel day that best fits your plans. Compare info to find the most convenient option for your journey. Data last updated 29 July 2025.

The most flights from YOW to USIL are scheduled on a Monday (12 on average). You will have fewer flight options on Monday, which is when the least amount of flights are scheduled (12 on average).

Reviews of airlines servicing Illinois

Get insights into the airlines that provide service to Illinois. Read reviews, discover amenities, and learn about the overall travel experience offered by airlines. Use this information to make informed decisions when choosing an airline for your flight to Illinois. Reviews last updated 29 July 2025.
Read reviews from past customers who have flown Porter Airlines,Delta, andUnited Airlines from Ottawa to Illinois. Reviews also offer insight into each airline's entertainment options, comfort, food, crew/service, and boarding process.
Porter Airlines
8.0
Very good
317 reviews
Check prices

Food

7.6

Crew

8.7

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Porter Airlines
8.0
Very good
317 reviews
Porter Airlines
8.0
Very good
317 reviews
Check prices

Food

7.6

Crew

8.7

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Delta
8.0
Very good
7,977 reviews
Porter Airlines
8.0
Very good
317 reviews
Check prices

Food

7.6

Crew

8.7

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
United Airlines
7.4
Good
8,899 reviews
Porter Airlines
8.0
Very good
317 reviews
Check prices

Food

7.6

Crew

8.7

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
WestJet
7.2
Good
2,973 reviews
Porter Airlines
8.0
Very good
317 reviews
Check prices

Food

7.6

Crew

8.7

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience
Air Canada
7.1
Good
9,822 reviews
Porter Airlines
8.0
Very good
317 reviews
Check prices

Food

7.6

Crew

8.7

Boarding

8.2

Overall

8.0

Entertainment

7.0

Comfort

8.0

Reviews

1 / 20
8.0
Excellent

Anonymous,Jul 2025

LIS - YYZ

Everything was on time and easy. Crew were nice on flights and helpful. International flight, so long and typically uncomfortable but not more than most. Food and drink service were below average but you get what you pay for. Overall, good experience

Related info for your journey

Find useful and relevant information for your journey from Ottawa to Illinois. Access travel guides, tips, and recommendations to enhance your travel experience. Get information about local attractions, weather, transportation options, and more.

  • What airport do you fly from for flights from Ottawa to Illinois?

    Ottawa (YOW) is the airport you will fly out of if you book a flight from Ottawa to Illinois. It is only a 10.6 km journey to Ottawa (YOW) from Ottawa’s city centre.

  • What are the cheapest airlines to fly from Ottawa to Illinois one-way?

    The cheapest airline one-way is Air Canada, with whom users have recently found tickets for as low as C$ 240. However, be on the lookout for offers from Porter Airlines and WestJet, as they are both options that can get you from Ottawa to Illinois for a low price.

  • What are the most popular routes from Ottawa to Illinois?

    Most travellers choose Ottawa - Chicago O'Hare Intl, Ottawa - Chicago Midway or Ottawa - Lambert-St Louis when deciding on the best route from Ottawa to Illinois.

  • What are the most reliable airlines from Ottawa to Illinois?

    Before booking your flight to Illinois from Ottawa, check out the most reliable airlines to get you to your destination on time: Avianca (93%), ANA (91%), GoJet( 89%).

  • What are the cheapest flights from Ottawa to Illinois?

    Looking for the cheapest flight from Ottawa to Illinois? While on average our users pay C$ 2,203, our data indicates the cheapest price to be C$ 278. The most popular route (Ottawa - Chicago O'Hare Intl), is priced around C$ 449.

  • Can I find deals for flights from Ottawa to Illinois that include hotel bookings?

    Yes. In addition to deals on Ottawa to Illinois flights, Cheapflights offers vacation packages that include both flights and hotel.

  • How can I find direct flights from Ottawa to Illinois?

    After entering your origin and destination, apply the non-stop filter on the search result page to find direct flights from Ottawa to Illinois.

  • Can I find deals for business class flights from Ottawa to Illinois?

    Yes. Cheapflights offers flight deals from Ottawa to Illinois by cabin class. In addition to browsing deals, you can also filter by cabin class on the search results page after making a search.

  • What is the cheapest month to book a flight from Ottawa to Illinois?

    Currently, January is the cheapest month in which you can book a flight from Ottawa to Illinois (average of C$ 261). Flying from Ottawa to Illinois in March is currently the most expensive (average of C$ 352). There are several factors that can impact the price of a flight, so comparing airlines, departure airports and flight times can provide users with more options.

See more FAQs

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Alternative routes for Ottawa to Illinois

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Top 3 airlines flying from Ottawa to Illinois

Discover the top 3 airlines that operate flights from Ottawa to Illinois. Compare their services, reliability, and customer satisfaction ratings to choose the airline that best suits your travel preferences and needs. Over the last 7 days, Cheapflights users made 629,999 searches. Data last updated 29 July 2025.
AirlineCheapestAverageFlexibilityOn-time
Porter AirlinesCheapestC$ 368AverageC$ 497FlexibilityNo cancel feeOn-time52%
Search Porter Airlines flights
United AirlinesCheapestC$ 462AverageC$ 681FlexibilityNo cancel feeOn-time69%
Search United Airlines flights
Air CanadaCheapestC$ 500AverageC$ 642FlexibilityNo cancel feeOn-time67%
Search Air Canada flights

Fly with Cheapflights

Find the best flight deals on Cheapflights, where travelers can enjoy low prices and a wide availability of flights to their desired destinations.

How does Cheapflights help users find flights from Ottawa to Illinois?

Cheapflights makes it easy to find Ottawa to Illinois flights by helping our users search from 900+ travel sites for deals. We also provide you with filters for cabin, price, airline, airports, number of stops, and many more to narrow down that perfect flight.

Why should you use Cheapflights to find cheap flight tickets from Ottawa to Illinois?

Cheapflights helps you find that perfect flight to Illinois from Ottawa by searching from hundreds of airlines and agencies you know and love. We are also free to use, in case you were wondering!

Can Cheapflights find flights from Ottawa to Illinois with no change fees?

Yes! Cheapflights helps users easily find flights from Ottawa to Illinois with no change fees.

Can Cheapflights notify me if prices for flights from Ottawa to Illinois become cheaper?

Yes, and it’s super simple to set up. Click the bell icon next to the flight deals above and provide a valid email address to enable Price Alerts. That’s it!

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